Adding maintenance notification configuration to cluster client. Integration with testing helper proxy server.

[petyaslavova]

Pull Request check-list

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• Is the new or changed code fully tested?
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Description of change

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[Copilot]

Pull Request Overview

This PR adds maintenance notification configuration support to the Redis cluster client, enabling applications to receive and handle maintenance events from Redis clusters. It also introduces a proxy-based testing infrastructure to simulate and validate maintenance notification handling.

• Adds maint_notifications_config parameter to RedisCluster and propagates it through the cluster node initialization
• Introduces comprehensive unit tests for maintenance notification classes and handlers
• Adds integration test helpers using a proxy server for testing notification behavior
• Updates Docker infrastructure to include proxy services for testing

Reviewed Changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
redis/cluster.py	Adds maint_notifications_config parameter to RedisCluster and NodesManager, propagates config to all cluster nodes
redis/client.py	Fixes grammar in documentation comment ("configuration" -> "configures")
tests/maint_notifications/test_maint_notifications.py	Comprehensive unit tests for notification classes, config, and handlers (897 lines)
tests/maint_notifications/test_cluster_maint_notifications_handling.py	Integration tests for cluster maintenance notification handling with proxy
tests/maint_notifications/proxy_server_helpers.py	Helper classes for proxy-based testing infrastructure
tests/maint_notifications/test_maint_notifications_handling.py	Documentation correction in docstring
docker-compose.yml	Adds proxy services and updates image tags for testing infrastructure
.gitignore	Adds /experimenting/ directory to ignore list

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